CN112713557A - Shielding and fixing integrated high-voltage end metal insert of gas insulation wall bushing - Google Patents
Shielding and fixing integrated high-voltage end metal insert of gas insulation wall bushing Download PDFInfo
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- CN112713557A CN112713557A CN202011315414.5A CN202011315414A CN112713557A CN 112713557 A CN112713557 A CN 112713557A CN 202011315414 A CN202011315414 A CN 202011315414A CN 112713557 A CN112713557 A CN 112713557A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
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Abstract
The invention discloses a shielding and fixing integrated high-voltage end metal insert of a gas insulation wall bushing. The method is characterized in that: the integration of the shield cylinder portion with the shield can portion allows the insert to be small, compact and increase the insulation distance; according to the electric field intensity distribution of the bevel edge and the chamfer angle of the shielding cover part at the three junctions uniformly; consider the mucilage binding mode of novel material insulator, connect central conducting rod and support insulator simultaneously through integral type structure, fix central conducting rod on support insulator. The invention solves the technical problem that flashover faults are easy to occur when gas insulated metal enclosed transmission lines (GILs), sleeves and other gas insulated equipment run for a long time due to the fact that the used metal insert does not consider the difference of the installation process of novel materials such as ceramic insulators and the problem of electric field distribution at the junction of a high-voltage end and a third junction when the central conducting rod is supported in related structures.
Description
Technical Field
The invention relates to the field of high-voltage direct-current transmission, in particular to a shielding and fixing integrated high-voltage end metal insert of a gas insulation wall bushing.
Background
The ultra-high voltage direct current transmission is an important means for interconnection of high-voltage, large-capacity and long-distance power transmission and a power grid in China, and has great significance for energy pattern construction in China. For extra-high voltage direct current transmission equipment, a supporting insulator matched with the metal insert is one of core components of the equipment, and the insulating property of the supporting insulator directly determines the reliability of equipment operation and even electric energy transmission. However, in recent years, in the actual operation of direct current equipment such as extra-high voltage wall bushing, gas insulated metal enclosed transmission line (GIL), and the like, equipment failure due to electric field concentration at the three junctions of the metal insert and the supporting insulator frequently occurs. The problem of insulation support of the extra-high voltage direct current wall bushing is also a worldwide technical problem, and is one of the few technical bottlenecks which are not broken through in the field of electric equipment manufacturing in China.
In recent years, some researches have been made on the insulation support problem of the wall bushing support insulator at home and abroad. For example, an article "research on conductor support structure of extra-high voltage direct current wall bushing (li zhen army, electric era, 2017) analyzes the wall bushing support structure, and it is considered that no support insulator needs to be added by increasing the diameter of the central conductive rod. However, for dc wall bushings with higher voltage ratings and longer center guide rod lengths, the deflection deformation can cause distortion of the electric field, thereby threatening the insulation performance. Therefore, it is necessary to introduce a support insulatorTo reduce the deflection of the central conductive rod. An article "800 kV extra-high voltage direct current wall bushing fault analysis and design improvement" (liu fir, high voltage technology, 2018) is commonly used for supporting insulators in high voltage direct current equipment at home and abroad at present by adopting high voltage SF6The flashover fault analysis of the epoxy resin material commonly used in gas insulation is carried out, and the surface insulation capability of the insulator is considered to be reduced in the working condition of the branch through-wall bushing. However, inorganic materials such as ceramics have higher temperature stability, aging resistance, and tracking resistance. The frequent insulation and mechanical failure of support insulators in recent years has made the development of ceramic material support insulators the direction of research. An apple-shaped voltage-sharing cover structure fixed central conducting rod and a supporting insulator are designed in an article of application of finite element numerical calculation technology to three-dimensional electric field simulation analysis (Zhang Shi Commen, high voltage technology, 2020). The metal insert structure has an unobvious shielding effect on an electric field, and two electric fields are concentrated, so that a strong field region is easily generated at a junction.
In addition, a metal shielding type insulating sleeve (application number: CN201920353461.5, zhang shi, wo 2019, Chongqing city electric power company in China network) wraps the central conducting rod with a metal shielding layer, but the structure only considers the electric field distribution between the central conductor and the shell, and does not solve the problem of uneven electric field distribution near the supporting insulator. In the patent "support structure of extra-high voltage dc wall bushing and its central conductor" (application number: CN201120525823.8, korea hui, heigh corp., ltd., 2011), a support insulator and a central conducting rod are fixed by an "apple-shaped" metal insert. This metal insert structure needs the central conducting rod of extra contact connection indoor side and outdoor side, should not be obvious to the shielding effect of electric field in addition, can not fine solution electric field concentration problem. The metal insert designed in the patent "high voltage bushing with support for conductor" (application No.: CN201280013369.5, D-emmelson, ABB technologies ltd, 2012) allows for shielding of the high voltage side electric field. The structure is not suitable for a metal insert structure fixed with a ceramic insulator in a cementing manner, and cannot be matched with the ceramic insulator to form a supporting mechanism.
In view of the above problems, no effective solution has been proposed. The fixation of inorganic materials such as ceramics and the like to metals requires cementing, which also causes support insulators, high-voltage end metal inserts and sulfur hexafluoride (SF)6) New insulation problems at the iso-insulating gas triple junction: the metal insert of the original structure is divided into two separated parts of a shielding cylinder and a shielding cover, and the insulation requirement under a higher voltage level cannot be met. Therefore, a new high-voltage end metal insert structure needs to be designed, and the mechanical stability of the supporting structure and the electric field uniformity at the three junctions are guaranteed.
The application of the insulating ceramic in the power system at home and abroad is limited to the equipment external insulation in the air environment, and the application of the insulating ceramic as an internal insulation support material for sulfur hexafluoride (SF) under a high-temperature gradient and strong direct-current electric field is never considered6) In the insulating gas, the research of the metal insert structure based on the guarantee of the insulating property of the new material has a plurality of blanks, and the patent is developed for SF aiming at the requirement6The insulating high-voltage direct-current wall bushing or GIL can fix the central guide rod and uniformly support the insulator and the product of the surface electric field of the metal insert.
Disclosure of Invention
The embodiment of the invention provides a shielding and fixing integrated high-voltage end metal insert of a gas insulation wall bushing, which at least solves the technical problem that flashover faults are easy to occur when gas insulation equipment such as a gas insulated metal enclosed transmission line (GIL) and a bushing runs for a long time because the used metal insert does not consider the difference of the installation process of a novel material such as a ceramic insulator and the electric field distribution problem at the junction of three high-voltage ends when a central conducting rod is supported in a related structure.
The invention provides an integrated metal insert for a high-voltage end of a wall bushing, which comprises: the shielding cylinder and the shielding cover are of an integrated structure, a bevel edge is arranged at the junction of the shielding cover, an arc chamfer is arranged at the end part, and electric fields on the top of the insulator and the surface of the high-voltage end metal insert are uniformly distributed through the shielding cover of the integrated metal insert; the shielding cylinder and the shielding cover of the integrated structure are simultaneously connected with the central conducting rod and the supporting insulator, and the central conducting rod is fixed on the supporting insulator.
Wherein, the central conducting rod of shield cylinder and shield cover simultaneous connection and the support insulator of integrated configuration include:
the central conducting rod penetrates through the shielding cylinder of the high-voltage end insert, and relative displacement and a corner between the central conducting rod and the high-voltage end metal insert are formed into fixed constraint through a flange;
the inner wall of the shielding case covers the top of the supporting insulator, and the supporting insulator and the high-voltage end metal insert are fixedly constrained by relative displacement and corners through cementing.
Further, fix through the cementing support insulator with the high-voltage metal inserts includes:
through the sufficient inside height of shield cover, guarantee with the part of support insulator contact satisfies the demand of mucilage binding ratio.
Generally, the insulation damage of a product can cause the insulation failure of the whole equipment, so that the equipment is immediately shut down, the safety operation of a power grid is greatly damaged, and the structure of the three junction parts needs reasonable geometric design to improve the distribution of an electric field. In order to reduce the electric field at the three junctions as much as possible, firstly, the bevel edge of the shielding cover is outwards extended and arranged at the top of the supporting insulator, and the electric field at the three junctions can be effectively relieved by the longer bevel edge and the larger included angle between the bevel edge and the insulator; secondly, the end part of the insert is provided with a shielding cover chamfer, and the electric field at the three junctions is effectively reduced by the shielding effect of metal on the direct current electric field, so that the phenomenon that the electric field at the top part of the supporting insulator is concentrated to cause surface flashover is avoided. A smaller chamfer radius may reduce the top surface field of the support insulator, but may also increase the surface field of the high end metal insert, considering SF6The surface breakdown field strength of the medium metal insert is higher than SF6The flashover field intensity along the surface of the middle insulator, so that the metal insert at the high-voltage end selects a smaller chamfer radius. The high-voltage end metal insert shielding cover part can improve the problem of electric field concentration of the high-voltage end through a certain bevel edge angle, bevel edge length and chamfer radius, and effectively improvesAnd the insulation margin is increased, thereby improving the reliability of the device.
In the embodiment of the invention, the electric field distribution characteristics of the wall bushing and the supporting structure of the central conducting rod are combined, and the high-voltage end metal insert is miniaturized and compacted by integrating the shielding cylinder part and the shielding cover part; according to the reduced volume of the metal insert, the space for arranging the supporting insulator is increased, and the insulation distance of the supporting insulator is increased. The electric field at the high-voltage end is uniformly distributed through the shielding cover part of the integrated metal insert; the integrated structure is simultaneously connected with the central conducting rod and the supporting insulator, so that the central conducting rod is fixed on the supporting insulator. And furthermore, the technical problem that flashover faults are easy to occur when gas-insulated metal-enclosed transmission lines (GILs), sleeves and other gas-insulated equipment runs for a long time due to the fact that the used metal insert does not consider the difference of the installation process of novel materials such as ceramic insulators and the problem of electric field distribution at the junction of a high-voltage end and a third junction in related structures when the central conducting rod is supported is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a high end metal insert according to the present disclosure;
FIG. 2 is a schematic cross-sectional view of a high end metal insert according to the teachings of the present invention;
fig. 3 is a schematic view of a high-voltage end metal insert in a gas-insulated electric power transmission apparatus according to the present disclosure;
FIG. 4 is a graph of the surface stress distribution at the interface of a metal insert and an insulator according to the present disclosure;
FIG. 5 is a graph of the electric field profile at the surface of a metal insert according to the present disclosure;
fig. 6 is a distribution diagram of the surface electric field of an insulator according to the present disclosure.
In the figure:
1-a central conductive rod;
2-a support insulator;
3-high-voltage end metal insert;
4-a shield can portion;
5-bevel edge of shielding case;
6-chamfering the shielding case;
7-insulating gas;
8-high voltage end metal insert shielding cylinder part.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to the embodiment of the invention, the structural embodiment of the shielding and fixing integrated high-voltage end metal insert of the gas-insulated wall bushing is provided, and it is noted that the structure in the schematic diagram of the attached drawings can be applied to different gas-insulated power transmission equipment, and although the insert structure is shown in the schematic diagram, the insert structure can be different from the specific structure in the figure in some cases.
The metal insert is made of aluminum alloy and is formed by one-time extrusion of a die. Fig. 1 is a schematic structural view of a shielding and fixing integrated high-voltage end metal insert of a gas-insulated wall bushing according to an embodiment of the invention.
The internal structure of the gas insulation wall bushing is a typical coaxial cylindrical structure, and the gas insulation wall bushing plays a role in connecting high-voltage direct-current electrical equipment inside and outside a valve hall of the converter station. The internal structure of the gas-insulated wall bushing is relatively typical, and the embodiment shows a specific implementation mode including an integrated high-voltage end metal insert, a ceramic support insulator and the like based on the structure.
As shown in fig. 1, there is provided a wall bushing high-voltage end integrated metal insert, the product includes: the high-voltage end metal insert shielding cylinder part 8 and the central conducting rod 1 are connected in a concentric structure, the high-voltage end metal insert shielding cylinder part and the supporting insulator 2 are glued inside and outside the top, namely the supporting insulator top is embedded into the high-voltage end metal insert shielding cylinder part 4, contact interfaces of the high-voltage end metal insert shielding cylinder part and the supporting insulator are fixed in a gluing mode, and huge mechanical stress can be borne, so that the central conducting rod is fixed on the supporting insulator.
Referring to fig. 2, the high-voltage end metal insert shielding part 4, the supporting insulator 2 and the SF in the environment6The electric field at the three junctions of the gases is concentrated, and the three junctions are the parts which are most likely to cause discharge and breakdown in high-voltage engineering so as to cause product damage. The insulation damage of the product can cause the integral insulation failure of the equipment, so that the equipment is immediately shut down, the safety operation of a power grid is greatly damaged, and the structure of the three junction parts needs reasonable geometric design to improve the distribution of an electric field. In order to reduce the electric field at the three junctions as much as possible, firstly, the bevel edge 5 of the shielding cover is outwards extended from the top of the supporting insulator, and the electric field at the three junctions can be effectively relieved by the longer bevel edge and the larger included angle between the bevel edge and the insulator; secondly, a shielding cover chamfer 6 is arranged at the end part of the insert and is made of metalThe shielding effect on the direct current electric field enables the electric field at the three junctions to be effectively reduced, and surface flashover caused by electric field concentration in the top area of the supporting insulator is avoided. A smaller chamfer radius may reduce the top surface field of the support insulator, but may also increase the surface field of the high end metal insert, considering SF6The surface breakdown field strength of the metal insert in the insulating gas 7 is higher than SF6The flashover field intensity along the surface of the middle insulator, so that the metal insert at the high-voltage end selects a smaller chamfer radius. The high-voltage end metal insert shielding cover part can improve the problem of electric field concentration of the high-voltage end through a certain bevel edge angle, bevel edge length and chamfer radius, so that the insulation margin is effectively improved, and the reliability of equipment is improved.
As shown in fig. 3, the structure includes: the shielding cylinder part of the high-voltage end metal insert with the length of 400mm and the outer diameter of 200mm is connected with the central conducting rod in a coaxial structure, and the bottom of the central conducting rod and the shielding cylinder part are provided with grooves and are reinforced by screws; the high-voltage end metal insert shielding cover part with the outer diameter of 200mm and the supporting insulator with the diameter of 100mm are glued inside and outside the top, namely the high-voltage end metal insert shielding cover part is embedded into the top of the supporting insulator, and the contact interface of the high-voltage end metal insert shielding cover part and the supporting insulator is fixed in a gluing mode. The assembly method of this embodiment enables the relative position of the central conductive rod and the support insulator to be fixed.
Furthermore, the supporting insulator can bear huge mechanical stress through the glue assembly of the insert. Fig. 4 is a surface stress distribution diagram of the junction between the metal insert and the insulator under extreme conditions of earthquake, and it can be seen that the maximum stress is distributed at both sides of the central conductive rod, which is about 6.5MPa, and the minimum stress is about 1.8 MPa. The yield strength of the high-pressure end metal insert is far less than that of metal, so that the high-pressure end metal insert can still ensure small stress distribution and a stable mechanical structure under a large load under an extreme working condition.
During design, the bevel edge of the shielding cover with the thickness of 20mm is outwards extended from the top of the supporting insulator, and the larger included angle between the bevel edge and the insulator is set to be 150 degrees; secondly, the end part of the insert is provided with a shielding cover chamfer with the chamfer radius of 20mm, and the electric field on the surface of the insert is uniform through the structure.
It should be noted that fig. 5 and fig. 6 are a surface electric field distribution diagram of the high-voltage end metal insert and a surface electric field distribution diagram of the insulator at the triple junction, respectively; the maximum field intensity of the surface electric field of the visible metal insert is about 5.5kV/mm, and the maximum field intensity of the top surface electric field of the insulator is about 3 kV/mm; are respectively less than SF6The breakdown field intensity of the gas and the flashover field intensity of the surface of the insulator. Through the shielding effect of metal to the direct current electric field for three juncture electric fields effectively reduce, avoid supporting insulator top region electric field concentration to initiate the surface flashover.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The utility model provides a fixed integral type high-pressure side metal insert of shielding of gas insulation wall bushing, includes: the shielding cylinder (3) and the shielding cover (4) are of an integrated structure, and are characterized in that,
an inclined edge (5) is arranged at the junction of the shielding cover (4), an arc chamfer (6) is arranged at the end part, and electric fields at the top of the insulator and the surface of the high-voltage end metal insert are uniformly distributed through the shielding cover (4) of the integrated metal insert;
the shielding cylinder (3) and the shielding cover (4) of the integrated structure are simultaneously connected with a central conducting rod (1) and a supporting insulator (2), and the central conducting rod is fixed on the supporting insulator;
wherein, central conducting rod (1) and support insulator (2) are connected simultaneously to shielding barrel (3) and shield cover (4) of integral structure and include:
the central conducting rod (1) penetrates into the shielding cylinder (3) of the high-voltage end insert, and relative displacement and a corner between the central conducting rod (1) and the high-voltage end metal insert are fixedly restricted through a flange;
the inner wall of the shielding case is coated on the top of the supporting insulator (2), and the supporting insulator (2) and the high-voltage end metal insert are fixedly constrained through relative displacement and corners between the supporting insulator and the high-voltage end metal insert by cementing.
2. Metal insert according to claim 1, characterized in that fixing the supporting insulator (2) and the high voltage metal insert by gluing comprises:
through the sufficient internal height of the shielding cover (4), the part which is in contact with the supporting insulator (2) is ensured to meet the requirement of the cementing ratio.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315414.5A CN112713557B (en) | 2020-11-20 | 2020-11-20 | Shielding and fixing integrated high-voltage end metal insert of gas insulation wall bushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315414.5A CN112713557B (en) | 2020-11-20 | 2020-11-20 | Shielding and fixing integrated high-voltage end metal insert of gas insulation wall bushing |
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| CN112713557A true CN112713557A (en) | 2021-04-27 |
| CN112713557B CN112713557B (en) | 2022-06-21 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131476A (en) * | 2000-10-26 | 2002-05-09 | Mitsubishi Heavy Ind Ltd | Cable replacement method |
| CN103684386A (en) * | 2013-12-05 | 2014-03-26 | 华北电力大学 | High-pressure solid switch |
| CN204832424U (en) * | 2015-07-20 | 2015-12-02 | 山东泰开互感器有限公司 | Super, portable GIS withstand voltage test equipment of extra -high voltage |
| CN105977887A (en) * | 2016-06-01 | 2016-09-28 | 中国西电电气股份有限公司 | Inflatable extra-high voltage direct current through-the-wall bushing |
| CN108321741A (en) * | 2018-02-08 | 2018-07-24 | 西安交通大学 | Ultra-high/extra-high voltage gas-insulated wall bushing center current－carrying conductor stay bolt structure and ultra-high/extra-high voltage gas-insulated wall bushing |
| CN207977696U (en) * | 2018-03-27 | 2018-10-16 | 西安西电开关电气有限公司 | A kind of exchange wall bushing of Mixed gas insulation shape metallic leak-proof structure |
| CN110729684A (en) * | 2019-10-31 | 2020-01-24 | 西安交通大学 | Ultra/extra-high voltage SF6Gas insulation wall bushing and insulation supporting structure thereof |
-
2020
- 2020-11-20 CN CN202011315414.5A patent/CN112713557B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002131476A (en) * | 2000-10-26 | 2002-05-09 | Mitsubishi Heavy Ind Ltd | Cable replacement method |
| CN103684386A (en) * | 2013-12-05 | 2014-03-26 | 华北电力大学 | High-pressure solid switch |
| CN204832424U (en) * | 2015-07-20 | 2015-12-02 | 山东泰开互感器有限公司 | Super, portable GIS withstand voltage test equipment of extra -high voltage |
| CN105977887A (en) * | 2016-06-01 | 2016-09-28 | 中国西电电气股份有限公司 | Inflatable extra-high voltage direct current through-the-wall bushing |
| CN108321741A (en) * | 2018-02-08 | 2018-07-24 | 西安交通大学 | Ultra-high/extra-high voltage gas-insulated wall bushing center current－carrying conductor stay bolt structure and ultra-high/extra-high voltage gas-insulated wall bushing |
| CN207977696U (en) * | 2018-03-27 | 2018-10-16 | 西安西电开关电气有限公司 | A kind of exchange wall bushing of Mixed gas insulation shape metallic leak-proof structure |
| CN110729684A (en) * | 2019-10-31 | 2020-01-24 | 西安交通大学 | Ultra/extra-high voltage SF6Gas insulation wall bushing and insulation supporting structure thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张施令等: "有限元数值计算技术应用于特高压穿墙套管三维", 《高电压技术》 * |
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